61722040 has 16 divisors (see below), whose sum is σ = 138874680. Its totient is φ = 24688800.

The previous prime is 61722007. The next prime is 61722047. The reversal of 61722040 is 4022716.

It is a super-2 number, since 2×61722040² = 7619220443523200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61722047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771486 + ... + 771565.

Almost surely, 2^61722040 is an apocalyptic number.

It is an amenable number.

61722040 is an abundant number, since it is smaller than the sum of its proper divisors (77152640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61722040 is a wasteful number, since it uses less digits than its factorization.

61722040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543062 (or 1543058 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 61722040 is about 7856.3375691221. The cubic root of 61722040 is about 395.1968041342.

Adding to 61722040 its reverse (4022716), we get a palindrome (65744756).

The spelling of 61722040 in words is "sixty-one million, seven hundred twenty-two thousand, forty".